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#EXTExtensions

Browser Extensions

Custom Chrome, Firefox, and Edge extensions, built to spec.

model: custom scope & deployment · contact for quote

~/telemetry/spec
Running
manifest
v3
browsers
chrome · firefox · edge
architecture
worker + content
distribution
stores (3)
Node health0%
○ waitingmeasuring...

~/scope

6 capability modules
01#MV3

Manifest V3 builds

Modern manifest V3 architecture with service workers, no legacy patterns that get rejected at review.

  • MV3
  • Service workers
  • Permissions
  • Review-safe
02#POLY

Cross-browser coverage

One build that behaves consistently across Chrome, Firefox, and Edge, with browser-specific quirks handled.

  • Polyfills
  • Quirk handling
  • Feature flags
03#UI

Popup & settings UI

A real UI for your extension, popup, options, and onboarding in React, not bare HTML.

  • React
  • Options page
  • Onboarding
  • i18n
04#WORKER

Content & background work

Content scripts that read pages, background workers that stay alive, and message passing that doesn't leak.

  • Content scripts
  • Workers
  • Message passing
  • Storage
05#STORE

Store submission

Packaging, review-readiness, store assets, and privacy disclosures handled end-to-end.

  • Store assets
  • Privacy policy
  • Review flow
06#HARDEN

Security by default

Least-privilege permissions, no remote code, and input sanitization, extensions that pass audit clean.

  • Least privilege
  • No remote code
  • Sanitization

~/stack

all runtimes production-validated

FOUNDATION

TypeScriptJavaScriptReact

FRAMEWORK

Manifest V3VitePlasmoCRX packaging

STATE CONTROL

chrome.storageIndexedDBSync

BACKEND CORE

Content scriptsBackground workersMessage passing

EVENT RUNTIME

Web StoreAdd-ons sitesVersioning

~/process

4-stage execution pipeline
  1. 01SCOPE

    Define what it does and exactly where it injects or interacts.

    output:Extension spec
  2. 02ARCHITECT

    Manifest, service worker, storage, and message-passing design.

    output:Extension blueprint
  3. 03EXECUTE

    Core functionality first, popup/UI polish second, cross-browser tested.

    output:Tested build
  4. 04HARDEN

    Package, privacy review, and store submission support.

    output:Live store listing

~/work-case-study

linked to live /work routes
case study

I'll share matching case studies and verified metrics on a call, scoped to what you're building.

~/action
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Uptime mindset